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Mini-type quantum relevancy photon pair source with adjustable wavelength and controllable frequency spectrum and generating method

A quantum correlation and photon pair technology, applied in the application field of quantum information technology, can solve the problems of limiting photon wavelength tuning range, reducing the purity of light source, wavelength limitation, etc., achieving low cost, high collection efficiency, and improving the degree of optical fiber Effect

Inactive Publication Date: 2014-07-02
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the phase-matching condition of the spontaneous four-wave mixing process in conventional fibers is usually only satisfied when the pump wavelength is located in the anomalous dispersion region near the zero-dispersion point of the fiber, thus limiting the wavelength of the generated correlated photon pairs to a distance from the pump In the wavelength range near the
This not only limits the wavelength tuning range of the photon pair, but also makes the photon pair susceptible to noise photons from Raman scattering, which in turn reduces the purity of the light source.

Method used

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  • Mini-type quantum relevancy photon pair source with adjustable wavelength and controllable frequency spectrum and generating method
  • Mini-type quantum relevancy photon pair source with adjustable wavelength and controllable frequency spectrum and generating method
  • Mini-type quantum relevancy photon pair source with adjustable wavelength and controllable frequency spectrum and generating method

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Experimental program
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Effect test

Embodiment 1

[0045] Embodiment 1: Quantum correlation photon pair source device based on photonic crystal fiber or micro-nano fiber

[0046] The device diagram of this embodiment is shown in figure 1 As shown, each part is detailed as follows:

[0047] Pumping light preparation part: the pulsed light output by the fiber mode-locked pulsed laser is coupled into a section of single-mode fiber through a lens, broadened into a supercontinuum in the single-mode fiber, and then coupled into free space through a lens. The broadened supercontinuum is filtered by a transmission grating to obtain pump light, and then the pump light is coupled into a photonic crystal fiber or a micro-nano fiber through a lens. By changing the angle and distance of the grating, the wavelength and bandwidth of the pump light can be tuned.

[0048]Photon pair generation part: the pump light generates quantum correlated photon pairs through the spontaneous four-wave mixing process in the photonic crystal fiber or micro...

Embodiment 2

[0051] Example 2: Preparation of wavelength-tunable quantum-correlated photon pairs whose signal photon wavelength covers the communication band by controlling photonic crystal fiber and pump light parameters

[0052] In this embodiment, a photonic crystal fiber with a core diameter of 5.5 microns and a cladding air ratio of 31.5% is used, and its dispersion characteristics are calculated by the step fiber analysis method to obtain the spontaneous four-wave mixing at different pump wavelengths. The wavelengths of signal photons and idler photons with frequency and phase matching conditions, such as figure 2 shown.

[0053] from figure 2 It can be seen that when the pump light wavelength is changed in the range of 1030nm to 1055nm, a wide range of wavelength tuning for signal photons and idler photons can be achieved. Among them, the wavelength tuning range of signal photons is 1263nm to 1601nm, which basically covers the common communication bands: O, E, S, C and L bands; ...

Embodiment 3

[0054] Example 3: Preparation of spectrally controllable quantum correlated photon pairs by controlling photonic crystal fiber and pump light parameters

[0055] In this embodiment, a photonic crystal fiber with a core diameter of 1.89 microns and a cladding air ratio of 29.6% is used to calculate its dispersion characteristics through the step fiber analysis method, and it is obtained that at different pump wavelengths, the spontaneous four-wave mixing Signal photon wavelength and idler photon wavelength under the condition of frequency and phase matching, such as image 3 shown. from image 3 It can be seen that when the wavelength of the pump light changes within the range of 960nm to 1055nm, the maximum wavelength of the signal photon is 1412nm and the minimum is 1162nm, while the minimum wavelength of the idler photon is 798nm and the maximum is 905nm.

[0056] For this photonic crystal fiber, at a certain central wavelength of the pump light, the spectral characteristi...

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Abstract

The invention belongs to the technical field of quantum, and provides a quantum relevancy photon pair source with the adjustable wavelength and the controllable frequency spectrum, and the quantum relevancy photon pair source has the advantages of being small, low in cost and high in purity. According to the technical scheme, a pulse laser with the tunable central wavelength and bandwidth in a wave band ranging from 950 nm to 1150 nm serves as a pumping light; a photonic crystal fiber with specific micro-structure parameters or a micro-nanofiber is selected to serve as a nonlinearity medium, and a quantum relevancy photon pair with the adjustable wavelength and the controllable frequency spectrum is generated by tuning the central wavelength and bandwidth of the pumping light through the spontaneous four-wave mixing process of the nonlinearity medium. The method is mainly applied to quantum technology occasions.

Description

technical field [0001] The invention belongs to the field of quantum technology, and in particular relates to the preparation of a miniaturized source of quantum-correlated photon pairs with adjustable wavelength and controllable spectrum, and the application of quantum-correlated photon pairs in quantum information technologies such as preparation of quantum states Background technique [0002] A quantum-correlated photon pair refers to a pair of photons with quantum-correlated characteristics in degrees of freedom such as time, energy, momentum, and polarization, and is usually referred to as a correlated photon pair. A variety of quantum states can be prepared by using quantum-correlated photon pairs: for example, photon entanglement states in different dimensions such as time, frequency, and polarization can be prepared by specific phase matching technology or post-selection technology; the detection of a photon in a photon pair can also be used signal to announce the pr...

Claims

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Application Information

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IPC IPC(8): G02F1/365G02F1/39
Inventor 李小英崔亮
Owner TIANJIN UNIV
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